﻿/*******************************************************************************************
 * Copyright (c) 2006-2009 Alex Robson, Rob Simmons, Craig Israel, and Rachel Twyford
 *
 * Use of this software in any form requires that you have both 
 * read and agreed to the following terms:
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the "Software"), 
 * to deal in the Software without restriction, including without limitation 
 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions: 
 *
 * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice, 
 * this list of conditions and the following disclaimer in the 
 * documentation and/or other materials provided with the distribution.
 * Neither the name of Nvigorate nor the names of its contributors may 
 * be used to endorse or promote products derived from this software without 
 * specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL ANY CONTRIBUTOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * ****************************************************************************************/

using System;
using System.IO;
using System.Xml;
using System.Xml.Serialization;
using Nvigorate.Common;
using Nvigorate.Logging;
using Nvigorate.Relational.Mapping.Interface;

namespace Nvigorate.Relational.Mapping.Index
{
    internal class XmlBindingMapLoader : IBindingMapLoader
    {
        #region Fields

        private readonly string _path;
        private readonly Type _mapType;
        private readonly IStreamReaderFactory _streamReaderFactory;

        #endregion

        #region Constructors

        public XmlBindingMapLoader(string path, Type mapType) : 
            this(path, mapType, new StreamReaderFactory())
        {
        }

        internal XmlBindingMapLoader(string path, Type mapType, 
                                     IStreamReaderFactory streamReaderFactory)
        {
            _path = path;
            _mapType = mapType;
            _streamReaderFactory = streamReaderFactory;            
        }
        #endregion

        #region Public Methods

        public IBindingMap GetMap()
        {
            var map = (IBindingMap) Activator.CreateInstance(_mapType);
            map.RepositoryName = map.RepositoryName ?? "";
            var serializableMap = map as IXmlSerializable;

            string mappedTypeName = _mapType == null ? "null" : _mapType.FullName;

            if (serializableMap != null)
            {
                try
                {
                    using (var reader = _streamReaderFactory.Create(_path))
                    {
                        serializableMap.ReadXml(new XmlTextReader(reader));
                    }
                    map.RepositoryName = map.RepositoryName;
                }
                catch (IOException ioex)
                {
                    LogManager.LogError(
                        ioex,
                        Severities.Moderate,
                        "An IO error occurred while attempting to load the map at {0} for Type '{1}'",
                        _path,
                        mappedTypeName);
                    throw;
                }
                catch (XmlException xmlex)
                {
                    LogManager.LogError(
                        xmlex,
                        Severities.Moderate,
                        "A deserialization error occurred while attempting to load the map at {0} for Type '{1}'",
                        _path,
                        mappedTypeName);
                    throw;
                }
                catch (Exception ex)
                {
                    LogManager.LogError(
                        ex,
                        Severities.Moderate,
                        "An unknown error occurred while attempting to load the map at {0} for Type '{1}'",
                        _path,
                        mappedTypeName);
                    throw;
                }
            }

            return map;
        }

        #endregion
    }
}